Wiki info about I-185 (M-82)

A single-seat cantilever monoplane with a closed cockpit and retractable landing gear with a tail wheel.
The first prototype flight took place on 21 June 1941. Only two of these fighters were built, with another rebuilt from the fourth I-185 prototype with the M-71 engine.
The plane was powered by the 18-cylinder twin-row air-cooled Shvetsov M-82A radial engine with a rated output of 1,390 hp (maximum power in emergency mode – 1,600 hp). It had the three-blade variable-pitch AV-5-119 metal propeller.
The fuel system included three fuel tanks: two in the central wing section and one in the fuselage. It used 4B-78 aviation fuel with an octane rating of no lower than 95. A single conduit in the bottom of the fuselage housed two oil coolers.
The airplane possessed three 20 mm synchronized Shpitalny-Vladimirov ShVAK autocannons. Tests were carried out on the I-185/M-82A with an ammunition complement of 500, 510 and 520 shells.
Four bomb racks were installed under the wing. They could carry four bombs of up to 100 kg or two of up to 250 kg. In addition, the design allowed the suspension of eight RS-82 rockets under the wing.
The two I-185/М-82А prototypes underwent practical testing in combat operations on the Kalinin front in the winter of 1942, and earned glowing recommendations from front-line pilots. The I-185's first combat flight took place on 9 December 1942, and its last on 12 January 1943.
The I-185/M-82A turned out to be a very reliable aircraft. Its engine didn't present any nasty surprises, and its maximum speed when it underwent state testing was only 15 km/h lower than that of the I-185/M-71. Its powerful armament also worked perfectly. Experts believed that this very plane could have been the prototype for a series of fighters. Nonetheless, the plane did not go into active service or series production.